I need 'resume' What are the options?

I have had good use from a Sandisk Sansa Clip as a podcast player, but need to replace it. Got a Clip Sport plus but resume-where-you-left-off does not work with the menu option Folders. My mp3s are kept in folders and are being replaced frequently. I’ve searched the forum but cannot find a practical way of using folders under the Book option.
So my question: Are there any Sandisk models still available where resume works when a file is played from the Folder menu option?